Matter – Part Matter – Part 11

What are some different ways to classify matter?

In Chemistry one way we In Chemistry one way we use isuse is::

ElementsCompoundsMixtures

Element - a substance that cannot be broken down by chemical methods

Examples- anything on the periodic table

Compound - a substance composed of two or more elements bonded together, always in the same ratio

Law of Definite Proportions - a chemical compound always has the same ratio of elements (by how many and their mass) ex. H2O has 2 hydrogen

1 oxygen

Examples of compounds:Examples of compounds:

Salt (NaCl)Sugar (C6H12O6)

Carbon dioxide (CO2)Dinitrogen monoxide (N2O)

Compounds can be broken down into elements by chemical methods (breaking bonds)

Substance (or pure substance) -

has the same composition, must be either a pure element or a pure compound

Mixture - a combination of two or more substances (elements or compounds), can be combined in any ratio

(variable composition)

Two types of mixtures:

Homogeneous Mixture or Solution -

always the same throughout, no matter where you take a sample

Examples - salt water, air, alloys, soda

Note - Solutions don’t have to be liquids!

Heterogeneous Mixture - contains parts that have different properties and composition

Examples - Pizza, ice cream sundaes, sand and water

Label the Following as Label the Following as elements, compounds, elements, compounds, homogeneous mixtures or homogeneous mixtures or heterogeneous mixturesheterogeneous mixturesBloodPizzaSteelDiamondCarbon monoxideNeonChiliAmmoniaNitric acidGatorade

Heterogeneous mixtureHeterogeneous mixtureHomogeneous mixtureElementCompoundElementHeterogeneous mixtureCompoundCompoundHomogeneous mixture